Severity: HighDescription of ProblemThe Citrix Presentation Server Client for Windows includes support for making ICA connections through proxy servers. An implementation flaw in this functionality may allow an attacker to execute arbitrary code in the context of the client process.This vulnerability could potentially be exploited by any malicious Web site visited by the user. This vulnerability is likely to be exploitable in most client deployments.This vulnerability is present in all versions of the Citrix Presentation Server Client for Windows earlier than 10.0.What Customers Should DoThis vulnerability has been addressed in the Citrix Presentation Server Client for Windows version 10.0 and later. Citrix strongly recommends that customers upgrade their Citrix Presentation Server Client for Windows to version 10.0 and later. These upgrades can be obtained from the following location:http://www.citrix.com/English/SS/downloads/downloads.asp?dID=2755AcknowledgementsCitrix thanks Karl Lynn of Juniper Networks for reporting this issue and working with us to protect customers.What Citrix Is DoingCitrix is proactively notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Base at http://support.citrix.com/.Obtaining Support on this IssueIf you require technical assistance with this issue, please contact Citrix Technical Support. Information for contacting Citrix Technical Support is available at http://support.citrix.com/.Reporting Security Vulnerabilities to CitrixCitrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities very seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com co

The Citrix Presentation Server Client for Windows includes support for making ICA connections through proxy servers. An implementation flaw in this functionality may allow an attacker to execute arbitrary code in the context of the client process.

This vulnerability could potentially be exploited by any malicious Web site visited by the user. This vulnerability is likely to be exploitable in most client deployments.

This vulnerability is present in all versions of the Citrix Presentation Server Client for Windows earlier than 10.0.

What Customers Should Do

This vulnerability has been addressed in the Citrix Presentation Server Client for Windows version 10.0 and later. Citrix strongly recommends that customers upgrade their Citrix Presentation Server Client for Windows to version 10.0 and later. These upgrades can be obtained from the following location:

Citrix thanks Karl Lynn of Juniper Networks for reporting this issue and working with us to protect customers.

What Citrix Is Doing

Citrix is proactively notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Base at http://support.citrix.com/.

Obtaining Support on this Issue

If you require technical assistance with this issue, please contact Citrix Technical Support. Information for contacting Citrix Technical Support is available at http://support.citrix.com/.

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities very seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com containing the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability.

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